Spatial and temporal heterogeneity of Kohlrausch–Williams–Watts stress relaxations in metallic glasses

Ishii, Akio

Computational Materials Science, 2021, 198, 110673

Number of Access:374（2025-08-29 08:17 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/89306

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Title
Spatial and temporal heterogeneity of Kohlrausch–Williams–Watts stress relaxations in metallic glasses
Creator
NRID
1000080773340 1000080773340
researchmap permalink
a_ishii a_ishii
ORCID
0000-0002-9369-6259 0000-0002-9369-6259
Scopus Author ID
7201558020 7201558020
CreatorName
Ishii, Akio
Subject
Kohlrausch–Williams–Watts (KWW) relaxation
Metallic glass
Molecular dynamics (MD)
Description
Akio Ishii, Spatial and temporal heterogeneity of Kohlrausch–Williams–Watts stress relaxations in metallic glasses, Computational Materials Science, Volume 198, 2021, 110673, ISSN 0927-0256, https://doi.org/10.1016/j.commatsci.2021.110673.
Abstract
We perform a molecular dynamics (MD) stress relaxation simulation for Zr50Cu40Al10 metallic glass to confirm that the time dependency of stress relaxation conforms with the Kohlrausch–Williams–Watts (KWW) equation, and to derive the temperature dependency of the Kohlrausch exponent βKWW. We also calculate local plastic deformation based on atomic strain, then discuss the morphology of relaxation and calculate the probability density of stress relaxation with respect to the characteristic time of relaxation from the number of deformed atoms. Afterward, we derive the time dependency of stress relaxation as a mode-averaged decay function, which expresses spatial and temporal heterogeneity. Both the results of simulation and calculation reproduce the KWW relaxation form and are in good agreement, confirming the spatially and temporally heterogeneous nature of KWW relaxation. The heterogeneity of the stress relaxation of metallic glass is determined by local stress changes caused by microscopic local plastic deformation.
Publisher
Elsevier
Source Title
Computational Materials Science
Volume (Issue)
198
Page
110673
Date of Issued
2021-07-02
Language
English
Handle URL
https://hdl.handle.net/11094/89306
PISSN
09270256
NCID
AA10854948
AA11526037
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1016/j.commatsci.2021.110673
Access Rights
open access
CopyRight
This is an open access article under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International license.
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Category
学術雑誌論文 Journal Article